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arXiv 1407.3161astro-ph.IM
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下一代毫米望远镜的数字频域多路复用读出电子学

Digital frequency domain multiplexing readout electronics for the next generation of millimeter telescopes

Amy N. Bender, Jean-François Cliche, Tijmen de Haan, Matt A. Dobbs, Adam J. Gilbert, Joshua Montgomery, Neil Rowlands, Graeme M. Smecher, Ken Smith, Andrew Wilson

摘要:

频域复用(fMux)是一种成熟的技术,用于毫米波天体物理仪器中的过渡边缘传感器(TES)测辐射热计的读出。在fMux中,来自多个探测器的信号在一对导线上读出,从而降低了系统的总低温热负载以及冷部件复杂性和成本。由POLARBEAR、EBEX和南极望远镜使用的当前数字fMux系统被超导量子干涉器件前置放大器的动态范围和总系统带宽限制在16的复用因子。增加多路复用是下一代大幅面TES相机的关键,例如SPT-3G和POLARBEAR 2,计划拥有15,000个探测器。在这里,我们介绍下一代fMux读出器,重点介绍热电子器件。在该系统中,多路复用系数增加到每个模块64个通道(2线),同时保持低噪声水平和检测器稳定性。这是通过增加系统带宽,降低动态范围的要求,通过主动反馈,和数字合成的电压偏置与一种新的多相滤波器算法。此外,新的fMux读出版本包括低功耗和抗辐射组件等功能,使其适用于未来的天基毫米望远镜,如LiteBIRD卫星。

英文摘要:

Frequency domain multiplexing (fMux) is an established technique for the readout of transition-edge sensor (TES) bolometers in millimeter-wavelength astrophysical instrumentation. In fMux, the signals from multiple detectors are read out on a single pair of wires reducing the total cryogenic thermal loading as well as the cold component complexity and cost of a system. The current digital fMux system, in use by POLARBEAR, EBEX, and the South Pole Telescope, is limited to a multiplexing factor of 16 by the dynamic range of the Superconducting Quantum Interference Device pre-amplifier and the total system bandwidth. Increased multiplexing is key for the next generation of large format TES cameras, such as SPT-3G and POLARBEAR2, which plan to have on the of order 15,000 detectors. Here, we present the next generation fMux readout, focusing on the warm electronics. In this system, the multiplexing factor increases to 64 channels per module (2 wires) while maintaining low noise levels and detector stability. This is achieved by increasing the system bandwidth, reducing the dynamic range requirements though active feedback, and digital synthesis of voltage biases with a novel polyphase filter algorithm. In addition, a version of the new fMux readout includes features such as low power consumption and radiation-hard components making it viable for future space-based millimeter telescopes such as the LiteBIRD satellite.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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